Shader Settings :
Noise Settings: Change the scale, color, depth and pan speed of the noise panning down .
Star Settings: Change the color speed, size and depth of 3 different stars on the shader.
Pupil Settings : Change pupil scale rotation speed color and much more.
Vig / Alpha Vig Settings : Change the Black ring out the out side of the eye, use alpha vig for a nice AA look on the edge if your eye fbx is too sharp .
Lighting and Shadowing Settings : Change the lighting and shadowing of the eyes (If you want it unlit you may turn it off) options for shadow color sharpness smoothness point lights etc.
Hue Settings : Change the colors of everything in the shader with easy to use sliders.